Hero of Precinct One

Whenever you cast a multicolored spell, create a 1/1 white Human creature token.

Rally the Ranks

As Rally the Ranks enters, choose a creature type.
Creatures you control of the chosen type get +1/+1.

Elvish Hexhunter

{G/W}, {T}, Sacrifice Elvish Hexhunter: Destroy target enchantment.

Mountain

Wild Cantor

({R/G} can be paid with either {R} or {G}.)
Sacrifice Wild Cantor: Add one mana of any color.

Boros Recruit

({R/W} can be paid with either {R} or {W}.)
First strike

Glittering Wish

You may reveal a multicolored card you own from outside the game and put it into your hand. Exile Glittering Wish.

Seedcradle Witch

{2}{G}{W}: Target creature gets +3/+3 until end of turn. Untap that creature.

Scuzzback Scrapper

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Safewright Quest

Search your library for a Forest or Plains card, reveal it, put it into your hand, then shuffle.

Jungle Shrine

Jungle Shrine enters tapped.
{T}: Add {R}, {G}, or {W}.

Plains

Fumigate

Destroy all creatures. You gain 1 life for each creature destroyed this way.

Guttural Response

Guildmages' Forum

{T}: Add {C}.
{1}, {T}: Add one mana of any color. If that mana is spent on a multicolored creature spell, that creature enters with an additional +1/+1 counter on it.

Second Harvest

For each token you control, create a token that's a copy of that permanent.

Fossil Find

Return a card at random from your graveyard to your hand, then reorder your graveyard as you choose.

Barkshell Blessing

Target creature gets +2/+2 until end of turn.
Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it and you may choose a new target for the copy.)